Here is a vertical surface piercing with 4mm Green Opals from Anatometal.

This is sometimes called a "vertical tragus piercing" due to its placement near the ear but is more properly referred to as a vertical surface piercing.

Using appropriate jewelry is ESSENTIAL for surface piercings. Curved barbells are notsuitable for this piercing.A curved barbell will not heal and ultimately reject due to the pressure of the jewelry on the skin.